The 120BT2800Z is an OEM original, high-precision focusing lens assembly engineered specifically for RayTools professional high-power fiber laser cutting heads, primarily optimized for the BM06K and BS06K series. Operating at a standard fiber laser wavelength of 1064nm, this pre-aligned optical-mechanical module is purpose-built to sustain dense energy fields in systems rated up to 6.0 kW. Its critical function is to tightly converge the incoming collimated laser beam into a flawless, minimum-diameter focal point to deliver ultimate processing speeds and razor-sharp edge quality.

The module consists of a premium compound lens set (combining matching biconvex and meniscus elements) securely mounted within a rugged, factory-sealed "new black type" protective housing sleeve. Crafted from ultra-pure imported fused silica, the optics feature an exceptionally high laser damage threshold and excellent thermal stability. Both outer surfaces are treated with advanced, multi-layer anti-reflective (AR) coatings to minimize power absorption and ensure maximum light transmission. This eliminates focal shift during prolonged multi-kilowatt industrial cutting cycles.